I have a 1990 Toyota motorhome with the 3.0 V6. It has just over 100k on it. When i do a compression test the #3 cylinder has 60psi and goes to 130psi when I give the cylinder a shot of oil. The #4 cylinder shows 0 psi with and without oil.
I found a 3.0 from a 94 with only 62k miles and want to do a swap, will it work without a lot of trouble?
I'm sure my answer is somewhere in this message board but I couldn't find it.

Thanks in advance,
Terry

 

Define a lot of trouble. Because it's not going to be a straightforward swap. It'll work. But you'll have to make it work. The main issues are going to be a bunch of wiring connector mismatches. Which shouldn't be that hard to deal with. Just swap connectors. Or use the older parts. I could be oversimplifying that. I wouldn't know for sure because I've never worked on a 93+ 3VZ-E. I do know enough about them to verify that many electronic parts are different(in appearance, not funtionality) than earlier models. But I also know enough to have good reason to believe that any 89+ 3VZ-E electronic parts should work on/are electronically compatible with any 89+ 3VZ-E(despite their different looks). It's just a matter of getting them wired up correctly(as in the ECU can't tell the difference between them if they're wired right). It's the 88 that's almost totally electronically incompatible with later years. Swapping connectors or using the other style parts wouldn't work if either engine were an 88. Unless you were to use the 88 ECU and wiring harness. But there's some rewiring involved with that route too. Which I'm not going to try explaining here.

*By swap I mean splice in if necessary.

 

Thanks MudHippy,
Do you suggest I get ahold of the 94 wire harness too?

 

After talking with the owner of the motor it turns out to be from a 92 and not a 94.

 

92 has a better chance of being a close enough match. Might not have to change anything. The engine wiring harness you'll probably want to get too, yes. Just in case. It wouldn't hurt to grab the ECU also. Not sure how much good that'll do you. But in theory, you could use it. If you absolutely had to. And knew exactly how to wire everything to it correctly. Which is more than just the engine wiring harness.

 

Bump,

Working on a 89 with a 3.0
Have an engine from a 95 with the harness.

Question is, Can I use an ECU from the 95 and not mess with any wiring?

Or am I better off getting a 89 3.0????

Thanks

 

Your ECU needs to match the sensors and harness on the engine

 

If you swap the ecu the dash wiring might plug in differently. Don't know for sure as I haven't done similar yet.

Wondering why not take your 89 engine apart and diag the issue. Worst case the engine is already junk and you get to validate it, best case there is something simple wrong like timing or a cam issue and you can run your existing engine. 100k miles is really low, I've seen these engines last 500k+. My guess is bad head gasket since it is unlikely the rings are bad with such low miles unless it was overheated in the past.